solid UNIT

What solid UNIT does

Solid UNIT, legally solid UNIT e.V., is a German registered association (eingetragener Verein) headquartered in Berlin that operates an innovation network focused on sustainable construction using mineral building materials such as CO2-reduced concrete, carbon concrete, 3D-printed concrete, recycled concrete, lightweight concrete, calcium silicate brick, brick, and precast concrete elements. Founded in 2019, the organization connects partners across construction planning, the construction industry, the building materials industry, and research and teaching through six strategic network teams covering CO2 reduction, resource efficiency, startups, climate resilience, sustainable transport and infrastructure construction, and modular construction. It maintains regional chapters across 10+ German federal states (including Baden-Württemberg, Bayern, Bremen, Hamburg, Hessen, Niedersachsen, Nordrhein-Westfalen, Saarland, Sachsen, and Schleswig-Holstein) and has signaled presence in Austria, Switzerland, and the Netherlands.

Solid UNIT generates revenue through membership fees across three tiers: regular membership for associations, chambers, and research institutions; sponsoring membership for companies, suppliers, manufacturers, planners, and architects; and advisory board membership for scientific participants. Its offerings are not commercial products but networked services: a knowledge platform (bau-klimaneutral.de), a project showcase database, position papers and publications, a technical glossary, an events program (Forum Zukunft Bauen, Wohnungsbau neu gedacht), a storytelling platform (solid STORIES), and a newsletter. Strategic partners include global materials majors (Holcim, CEMEX), large contractors (STRABAG, Züblin, Göldbeck), industry associations (DGfM, Bundesverband Ziegel, Bundesverband Kalksandstein, FDB, Bundesverband der Deutschen Transportbetonindustrie), and research institutions (KIT), with the network engaging politically through climate advisory board meetings at the German Bundestag and state parliaments.

Operationally, Solid UNIT is governed by a board chaired by Tobias Riffel (also Vice-President of Bauwirtschaft Baden-Württemberg) with Thomas Zawalski as Geschäftsführer and a board composed predominantly of representatives from member associations and regional chapters. Recent ecosystem activity in 2025-2026 has showcased member-company innovations such as Röser GmbH's reCO2ver® concrete recycling (up to 15 kg CO2 bound per tonne of demolition material, plus 50-60 kg CO2 per tonne of cement stone dust via recarbonation), SÜLZLE's STOOX reinforcement steel (CO2 footprint below 400 kg CO2 per tonne vs. 1,770 kg global average), Kronimus's Durakron block steps (35% CO2 reduction per unit), B2PURE® BioBitumen, KS*ReCO CO2-optimized limestone brick, and KIT's NT-Belitzement circular concrete. The organization is member-funded with no external equity backing, and financials are not publicly disclosed.

Name

solid UNIT

Legal name

solid UNIT e.V.

Website

https://solid-unit.de

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

51–100 employees

Short description

Solid UNIT is a German registered association operating an innovation network for sustainable construction with mineral building materials, connecting construction firms, materials manufacturers, trade associations, and research institutions across 10+ German federal states via membership-based recurring fees.

Ownership category

akta.pro rank

Product category

Construction Industry Network and Knowledge Platform

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Infrastructure, Engineering & Public Works Technical Assistance (WASH/Transport/Energy) (BPADAEAF)

akta.pro secondary industries

Construction Management & General Contracting (EPCM, Scheduling, QA/QC, HSE) (EUAMAFAJ), Environmental & Permitting Compliance During Construction (Erosion Control, Wildlife Mitigation, Monitoring) (EUAMAFAM)

Keywords

• Sustainable construction network
• Mineral building materials
• Construction industry association
• Climate-neutral building
• Innovation partnership

Headquarters

HQ city

Berlin

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Others

Revenue model

1. Membership Fees: solid UNIT operates as a membership-based association with different types of membership: regular membership for associations, chambers, and research institutions; sponsoring membership for companies, suppliers, manufacturers, planners, and architects; and advisory board membership for scientific participation.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

solid UNIT operates a membership-based innovation network (solid UNIT Netzwerk) that connects partners from construction planning, the construction industry, the building materials industry, and research and education to drive innovation in sustainable construction with mineral building materials such as CO2-reduced concrete, carbon concrete, 3D concrete printing, recycled concrete, lightweight concrete, calcium silicate brick, brick, and precast concrete elements. The network delivers value through six strategic teams covering CO2 reduction, resource efficiency, start-ups, climate resilience, sustainable transport/infrastructure construction, and modular construction, supported by a knowledge platform, project showcase, publications, events, newsletter, glossary, and political advocacy via the Klimabeirat.

Product overview

solid UNIT is an innovation network for sustainable construction with mineral building materials, not a traditional product company. The organization connects partners from construction planning, industry, building materials sector, and research. Its offerings include a knowledge platform on climate-neutral construction, a project showcase database, publications/position papers, events/forums, and networking services. The network organizes six strategic teams focused on CO2 reduction, resource efficiency, startups, climate resilience, sustainable transport/infrastructure construction, and modular construction. Partner membership is available at national and regional (state) levels including Baden-Württemberg, Bavaria, and other German states.

Differentiator

Problem solved

Functional benefit

Products and services

• solid UNIT Netzwerk (Innovation Network) Membership-based innovation network connecting partners from construction planning, the construction industry, the building materials industry, and research/education to drive sustainable construction with mineral building materials; organized around six strategic network teams.
• Klimaneutral Massiv Bauen Wissensplattform Knowledge platform providing information on climate-neutral solid construction for planners, architects, construction companies, and education professionals.
• solid STORIES Platform presenting stories about sustainable construction from the next generation of construction professionals.
• Veranstaltungen (Events Program) Event organization service hosting forums, workshops, and conferences on sustainable construction topics such as "Wohnungsbau neu gedacht" and "Forum Zukunft Bauen".
• Massivbau-Projekte (Project Showcase) Database of exemplary innovative solid construction projects demonstrating sustainable building practices with categories including residential, commercial, public buildings, infrastructure, 3D printing, carbon concrete, and CO2-reduced concrete.
• Publikationen (Position Papers and Publications) Position papers, climate resilience recommendations, and policy guidance on sustainable construction with mineral building materials, including contributions from member organizations DGfM, IZB, Bundesverband Ziegel, and Kalksandstein.
• Glossar (Technical Glossary) Technical glossary explaining construction terminology including 3D printing, building component activation, concrete precast parts, reinforcement, BIM, carbonation, carbon concrete, CO2 reduction, cradle-to-cradle, lightweight concrete, modular construction, and recycling.
• Newsletter Service Email newsletter keeping subscribers informed about solid UNIT news and updates; distributed via the Sendinblue platform.

Quantifiable outcome

• Up to 15 kg CO2 bound per tonne of crushed concrete demolition material through reCO2ver® process
• +3 more outcomes

Segments4 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature3 records

Partnerships

16 partnerships are on record, tiered core and minor.

• InformationsZentrum Beton (IZB)coreStrategic or Co-development PartnerInformationsZentrum Beton is a core network partner providing expertise on concrete construction and sustainable building with concrete materials.
• HolcimcoreStrategic or Co-development PartnerHolcim (formerly HeidelbergCement) is a global building materials company and key partner in sustainable concrete innovation.
• ZüblincoreStrategic or Co-development PartnerEd. Züblin AG is a major construction company and partner in sustainable construction projects within the network.
• CEMEXcoreStrategic or Co-development PartnerCEMEX is a global building materials company and partner in sustainable construction innovation.
• Deutsche Gesellschaft für Mauerwerksbau (DGfM)coreStrategic or Co-development PartnerGerman Society for Masonry Construction is a key partner providing expertise on brick and masonry construction methods.
• Bundesverband ZiegelcoreStrategic or Co-development PartnerGerman Brick Association provides expertise on brick production and sustainable masonry construction.
• Bundesverband KalksandsteincoreStrategic or Co-development PartnerGerman Calcium Silicate Brick Association provides expertise on calcium silicate brick for sustainable construction.
• Karlsruher Institut für Technologie (KIT)coreStrategic or Co-development PartnerKIT contributes research expertise to the network, particularly on climate-neutral circular concrete through cement recycling and carbonation.
• Röser GmbHcoreTechnology or IntegrationRöser GmbH developed the reCO2ver® technology for concrete recycling, which converts demolished concrete into high-quality recycled aggregate for new concrete production.
• SÜLZLE StahlpartnercoreTechnology or IntegrationSÜLZLE Stahlpartner developed STOOX sustainable reinforcement steel with documented CO2 footprint, targeting reduced emissions in construction.
• Bundesstiftung BauakademiecoreStrategic or Co-development PartnerBundesstiftung Bauakademie supports the testing of innovative construction methods and advocates for scaling new solutions through the network.
• Deutsche Gesellschaft für Nachhaltiges Bauen (DGNB)coreStrategic or Co-development PartnerDGNB provides expertise on sustainable building certification and contributes to the climate advisory board.
• STRABAGcoreStrategic or Co-development PartnerSTRABAG is a major European construction company and network partner for sustainable construction.
• GöldbeckminorStrategic or Co-development PartnerGöldbeck is a construction company partner in the network.
• Fachvereinigung Deutscher Betonfertigteilbau (FDB)coreStrategic or Co-development PartnerFDB provides expertise on precast concrete construction methods and sustainable building practices.
• GROUNDBREAKERSminorGTM or Marketing PartnerNew innovation alliance between GROUNDBREAKERS and solid UNIT Baden-Württemberg for promoting sustainable construction.

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• DGNB (Deutsche Gesellschaft für Nachhaltiges Bauen): Germany's leading sustainable building certification body. Overlaps with solid UNIT on promoting climate-friendly construction, share partners, and target similar members (planners, architects, builders) — but is broader in scope across all building types.
• Bauwirtschaft Baden-Württemberg: Regional German construction industry association whose Vice-President also chairs solid UNIT Deutschland. Operates as an overlapping regional industry body with shared member base and policy advocacy in construction.
• Bundesverband Baustoffe – Steine und Erden: German trade association for the building materials industry (stones and earths). Represents many of the same manufacturers as solid UNIT's members and engages on parallel policy and decarbonization topics.
• Concrete Sustainability Council: Global multi-stakeholder organization driving sustainable practices in the concrete value chain. Closely aligned with solid UNIT's focus on CO2-reduced concrete, recycled aggregates, and responsible sourcing of mineral materials.

Emerging players

• CarbonCure Technologies: Concrete technology company commercializing CO2 injection during mixing. Competes in the same thematic space (CO2-reduced concrete) that solid UNIT showcases, but does so as a product company rather than as an industry network.
• Construction Innovation Hub (UK): UK-based innovation network driving productivity and sustainability in construction. Mirrors solid UNIT's model of convening industry, research and government to accelerate adoption of new methods and materials, but focused on the UK market.

Broad incumbents

• Hauptverband der Deutschen Bauindustrie: Germany's main construction industry federation representing large contractors. Board representation overlaps with solid UNIT's leadership and covers broader policy and labor issues across the German building sector.
• Global Cement and Concrete Association (GCCA): Global industry association for the cement and concrete sector advancing net-zero roadmaps and member commitments. Comparable mission to solid UNIT's CO2 reduction team but at global scale and focused specifically on cement/concrete manufacturers.
• CEMBUREAU: European cement industry association representing producers and lobbying at EU level on decarbonization. Shares solid UNIT's interest in low-CO2 cementitious materials and engages a comparable set of corporate members.
• World Business Council for Sustainable Development (WBCSD): Global CEO-led organization advocating business action on sustainability. Operates at a much broader scope than solid UNIT but engages overlapping multinational construction and materials members on climate and built environment programs.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/solid-unit-e-v/?originalSubdomain=de
• Instagraminstagram.com/solid_unit

Revenue estimate

Valuation estimate

Number of profiles

Profiles17 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about solid UNIT